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How to catch Thresher

Alopias vulpinus (Bonnaterre, 1788)

About Thresher fishing

The common thresher is a large pelagic shark belonging to the family Alopiidae, immediately recognised by its enormous, scythe-like upper caudal lobe that matches the entire body in length. It possesses a streamlined fusiform body, a short pointed snout, and small dark eyes, with a metallic purplish brown or grey back that contrasts sharply against a brilliant white belly extending across the pectoral fin bases. Growing to massive proportions, this oceanic wanderer inhabits surface waters down to considerable depths over continental shelves and open seas. It is a highly active, migratory predator that feeds primarily on schooling forage fishes and squids, using its signature elongated tail in a whip-like motion to stun prey before consumption. Despite its formidable size and reputation for offering an exceptional fight on rod and line, it remains timid and largely harmless to humans.

  • Difficulty

    Medium

  • Average size

    450 cm TL

  • Market value

    High

  • Habitat

    Saltwater

  • Season

    Summer, Autumn

  • Also known as

    Atlantic thresher, Big-eye thresher, Common thresher, Common thresher shark, Fox shark, Grayfish

Thresher

Caudal shape

Extremely long, strap-like upper tail lobe uniquely identifies this pelagic thresher shark.

Mouth position

Sub-terminal mouth position on the underside characterizes this predatory shark species.

White patch

Conspicuous white abdominal patch extending over the pectoral fin base distinguishes it.

Thresher fishing facts

Characteristics

  • Typical size

    450 cm TL (max 573.3 cm TL )

  • Typical weight

    35 kg (max 348 kg )

  • Preferred temperature

    11.6–28.2 °C

  • Depth

    0–650 m

  • Longevity

    25 years

  • Body shape

    Fusiform / Normal

  • Commercial?

  • Vulnerability score

    76.7

Best hours

  • Dawn

    First light

    Peak

  • Morning

    After sunrise

    Active

  • Midday

    High sun

    Low

  • Afternoon

    Late day

    Low

  • Dusk

    Last light

    Peak

  • Night

    After dark

    Active

When to fish for Thresher

01
January
02
February
03
March
04
April
05
May
06
June
07
July
08
August
09
September
10 Now
October
11
November
12
December

How to catch Thresher

Tips for catching Thresher

Targeting this powerful pelagic shark requires heavy boat-based gear and considerable patience, typically focusing on coastal and offshore waters during the warmer summer and autumn months when the species migrates into shallower regions. Anglers generally rely on drifting with large dead baits or live fish suspended beneath balloons or buoys at varying depths to match the natural pelagic feeding zone of the shark. Rigging strong wire traces and heavy-duty saltwater tackle is essential, as the fish is renowned for its blistering runs, aerial leaps, and stubborn resistance when hooked. Dawn and dusk often provide favourable windows for encounters, particularly around deep drop-offs, banks, and areas holding dense concentrations of schooling baitfish where the predators hunt.

Other names for Thresher

Local and alternate names anglers use for Thresher.

  • Thresher
  • Thresher shark
  • Thintail thresher
  • Thrasher
  • Whip-tailed shark
  • Fox shark
  • Common thresher shark
  • Common thresher
  • Big-eye thresher
  • Grayfish
  • Green thresher
  • Sea fox
  • Slasher
  • Swingletail
  • Swiveltail
  • Tresher shark
  • Swivetail
  • Zorro thresher shark

Best equipment to catch Thresher

Compare fishing methods for Thresher — sized kit for each technique.

Note: Typical fish is 35 kg Our algorithm will suggest the best equipment for you based on this weight.

Best lures and baits for Thresher

Ranked lures and natural baits from every method, best first.

How Thresher migrates — Oceanodromous

Migrates within the sea between spawning, nursery and feeding grounds, and never enters fresh water. Follow its seasonal shifts along the coast and offshore.

How Thresher migrates — Oceanodromous 1. Young: Born live, not hatched from eggs. 2. Juveniles: Grow up in sheltered nursery waters. 3. Adults: Range widely over the feeding grounds. 4. Mature adults: Return to the breeding grounds to give birth.
Breeding grounds Nursery grounds Feeding grounds

1 Young

Breeding grounds

Born live, not hatched from eggs.

2 Juveniles

Nursery grounds

Grow up in sheltered nursery waters.

3 Adults

Feeding grounds

Range widely over the feeding grounds.

4 Mature adults

→ Breeding grounds

Return to the breeding grounds to give birth.

It stays in the sea and never runs up into fresh water.

Hover or tap a number to read each stage.

Diet and behavior of Thresher

  • Diet

    Top predator

  • Feeds by

    Hunts animals

  • Hunts

    Dawn · Dusk

Where Thresher lives

Pelagic in the open ocean beyond the shelf break.

Habitats
Saltwater
Depth zone
Epipelagic, Mesopelagic
0–650 m
Usually 0–200 m
Water column
Open water
Does not use the seabed

Where this species lives

Where to fish for Thresher

Mapped fishing spots where Thresher is recorded — open a pin for access and methods.

Oneroa Bay

AucklandAucklandNew Zealand